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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

11538 results found.

  1. Fermi trigger No 739506569: Global MASTER-Net observations report
  2. GRB 240608A: Fermi GBM Final Real-time Localization
  3. Fermi GRB 240607A: Global MASTER-Net observations report
  4. GRB 240607A: Fermi GBM Observation
  5. GRB 240606B: Fermi GBM Observation
  6. GRB 240607A: AstroSat CZTI detection of bright long burst
  7. GRB 240607A: Fermi GBM detection of a very bright burst
  8. GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
  9. GRB 240607A: Fermi GBM Final Real-time Localization
  10. Fermi trigger No 739373591: Global MASTER-Net observations report
  11. Konus-Wind detection of GRB 240603A
  12. Fermi GRB 240604A: Global MASTER-Net observations report
  13. Fermi GRB 240605A: Global MASTER-Net observations report
  14. Fermi GRB 240605C: Global MASTER-Net observations report
  15. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  16. GRB 240605C: Fermi GBM Final Real-time Localization
  17. IPN triangulation of GRB 240603A
  18. GRB 240605B: Fermi GBM Final Real-time Localization
  19. GRB 240604A: Fermi GBM Final Localization
  20. GRB 240605A: Fermi GBM Final Real-time Localization
  21. Fermi GRB 240603C: Global MASTER-Net observations report
  22. GRB 240603A: Fermi GBM Final Localization
  23. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  24. GRB 240603C: Fermi GBM Final Real-time Localization
  25. Fermi GRB 240602A: Global MASTER-Net observations report
  26. GRB 240602A: Fermi GBM Final Real-time Localization
  27. GRB 240527B: Swift-XRT afterglow detection
  28. GRB 240527B: Fermi GBM Observation
  29. Fermi GRB 240527A: Global MASTER-Net observations report
  30. GRB 240527B: Fermi-LAT detection
  31. Fermi GRB 240527B: Global MASTER-Net observations report
  32. GRB 240527B: Fermi GBM Final Localization
  33. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  34. GRB 240527A: Fermi GBM Final Real-time Localization
  35. Fermi trigger No 738348224: Global MASTER-Net observations report
  36. Fermi trigger No 738330463: Global MASTER-Net observations report
  37. GRB 240521B: Fermi GBM Observation
  38. Fermi GBM Sub-Threshold Detection of GRB 240516B
  39. GRB 240513A: Swift-XRT afterglow detection
  40. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  41. Fermi trigger No 737996942: Global MASTER-Net observations report
  42. GRB 240516B: AstroSat CZTI detection
  43. GRB 240514B: VZLUSAT-2 detection
  44. GRB 240504A: VZLUSAT-2 detection
  45. GRB 240502A: VZLUSAT-2 detection
  46. GRB 240519A: GRBAlpha detection
  47. GRB 240519A: AstroSat CZTI detection
  48. Fermi trigger No 737788024: Global MASTER-Net observations report
  49. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  50. Fermi GRB 240517A: Global MASTER-Net observations report
  51. GRB 240516A ATCA radio observations
  52. IPN triangulation of GRB 240514B (short)
  53. GRB 240513A: Swift ToO observations
  54. GRB 240517A: Fermi GBM Final Real-time Localization
  55. Konus-Wind detection of GRB 240513A
  56. GRB 240516A: AstroSat CZTI detection
  57. Fermi trigger No 737559855: Global MASTER-Net observations report
  58. GRB 240516A: Fermi GBM Observation
  59. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  60. GRB 240516A: GOTO optical upper limit
  61. Fermi trigger No 737523389: Global MASTER-Net observations report
  62. GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
  63. Fermi trigger No 737476171: Global MASTER-Net observations report
  64. GRB 240514B: GOTO candidate optical counterpart
  65. Fermi Gamma-ray Burst Monitor list of triggers that are not a GRB
  66. GRB 240514B: GRBAlpha detection
  67. GRB 240514B: Fermi GBM Detection
  68. GRB 240513A: Fermi GBM observation
  69. GRB 240513A: Swift-XRT observations
  70. GRB 240514C: Fermi GBM Final Real-time Localization
  71. Fermi GRB 240514B: Global MASTER-Net observations report
  72. Fermi Gamma-ray Burst Monitor triggers 737345659/240514093 and GRB240514A are not GRBs
  73. GRB 240514B: Fermi GBM Final Real-time Localization
  74. GRB 240514A: Fermi GBM Final Real-time Localization
  75. GRB 240513A: Tiled Swift observations
  76. GRB 240513A: Fermi-LAT detection
  77. GRB 240511A: Fermi GBM Observation
  78. Fermi GRB 240513B: Global MASTER-Net observations report
  79. Fermi trigger No 737277727: Global MASTER-Net observations report
  80. GRB 240513B: Fermi GBM Final Real-time Localization
  81. GRB 240513A: AstroSat CZTI detection
  82. Fermi trigger No 737258655: Global MASTER-Net observations report
  83. GRB 240511A: J-band observations with WINTER
  84. Fermi trigger No 737247400: Global MASTER-Net observations report
  85. Fermi trigger No 737244199: Global MASTER-Net observations report
  86. Fermi trigger No 737218721: Global MASTER-Net observations report
  87. Fermi trigger No 737196587: Global MASTER-Net observations report
  88. Fermi trigger No 737168073: Global MASTER-Net observations report
  89. GRB 240511A : MITSuME Akeno optical upper limits
  90. GRB 240511A: optical afterglow detection from the NOT
  91. Fermi Gamma-ray Burst Monitor trigger 737102480/240511279 is not a GRB
  92. Fermi Gamma-ray Burst Monitor trigger 737111207/240511380 is not a GRB
  93. Fermi GBM trigger 737105243/240511311 is not a GRB
  94. Fermi trigger No 737173236: Global MASTER-Net observations report
  95. Fermi GRB 240511A: Global MASTER-Net observations report
  96. Fermi trigger No 737105243: Global MASTER-Net observations report
  97. Fermi Gamma-ray Burst Monitor trigger 737133200/240511634 is not a GRB
  98. Fermi trigger No 737152719: Global MASTER-Net observations report
  99. GRB 240511A: Fermi GBM Final Real-time Localization
  100. Fermi trigger No 737102480: Global MASTER-Net observations report

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